Fred nevegold



UNITED STATES PATENT OFFICE0 FRED NEVEGOLD, OF COLUMBIA, PENNSYLVANIA.

M ETA L-ROLLING M I LL.

SPECIFICATION forming part of Letters Patent No. 480,609, dated August9, 1892.

Application filed September 15, 1891. Serial No. 405,'786. (No model.)

To all whom it may cancer-n.-

Be it known that I, FRED NEVEGOLD, of Columbia, in the county'ofLancaster and State of Pennsylvania, have invented certain new anduseful Improvemenis in Metal-Rolling Mills; and I do hereby declare thatthe following is afull, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon,which form part of this specification, in which- Figu'e 1is a side elevation of a pair ot' my improved reducingrolls formetal-rolling mills. Fig. 2 is a detail vertical longitudinal sectionshowing the pass between the rolls. Fig. 3 is a diagramnaticalhorizontal sectional and plan view showing the relation of thefillet-ribs of the rolls. Fig. 4 is a detail view illust-rating aroll-train. Fig. 5 is a detail view illustrating a section of a barbefore and after passing through the rolls by the aid of dotted lines.

This invention is an improvementin metalrolling mills; and its objectsare to prevent finning of the bars while being rolled, and to enable thebar to be passed directly through a series of reducing-rolls inimmediate succession without turning or twisting the bar; and theseobjects I accomplish by the novel construction of the reducing-rolls inwhich lies my invention, and which will be clearly understood from thefollowing description and claims.

Referring to the drawings by letter, A a represent the uppei' and loweropposed rolls of a reducing pair which are constructed alike, but faceendwi se in difierent directions,

'and are suitably mounted in bearings and housings (not shown) of anysuitable constrnction-such, for instance, as are shown in my LettersPatent No. 460,882. Each roll may be described as consisting of twolarge collars B C, fixed on the roll-shaft and set close together, they,in fact, being preferably formcd integral, and each being double-beveledat its edge or A-shaped i'n cross-section at its periphery, so that atriangular or V-shaped groove is fornied between the collars. Collar Bis larger and of greater diameter than collar C. The inner face bofcollar B lies about perpendicular to the opposed inner face c of collarC, as shown, and from the apex of the collar O its outer face c' slopesdownward or inward toward the shaft, so as not to interfere with the adjustment of the rolls in relation to each other. When rolls A a are inproper relative position, collars B C of the respective rolls adjoineach other, and faces b b and c c of the respective rolls are diagonallyopposed and parallel, and the grooves in the two rolls constitute arectangular pass or opening D between the rolls, through which the barsof metal are passed while being operated upon and reduced. Faces c c arethe guide-faces and b b the working faces of the rolls, altlough theformer also have a share in the reduction of a bar when the rolls areadjusted to operate on large-sized bars. The bottoms of the grooves arenot sharp, but have proper fillets d left in them, as is usual in thisclass of machines.

At the apex of collar B ot' each roll, on the face b, is formcd what Icall a fillet-rib or corner-working rib b', which is an annular rimformed integral with the collar and faceb and havingits outer facebeveled off fiush with the outer face of collar B, but its inner face isbeveled at a greater angle to the roll-axis than face b, so that itforms a slight angular oifset at the outer periphery of faceb or topedge of the groove. The fillet-rib b' lies opposite the apex of thecollar C, which is slightly tapered or rounded, as at 02, so that a linedrawn in the pass in the plane of the inner face o of collar C When therolls are adjusted to work on the largest-sized bars would strike theinner face of the fillet-rib.

By reference to Fig. 2 it will be seen that while the pass is properlyrectangular or Square in cross-section, having four main sides or faces.it is really sex-agon al, because the tillet-ribs b' form two very shortsides at two diametrically-opposed corners of the pass. The object ofthe fillet-ribs therefore is to keep down and prevent finning of themetal, because while being compressed by the rolls in passingtherebetween through pass D' the metal crowded toward the meeting edgesof the rolls at the sides of the pass is worked back into the body ofthe bar by the angular fillet-ribs b' and kept from finning. In otherwords, when the rolls are running and work- ICO ing on a metal bar offull size the faces b c work the four main sides of the bar and compressit 'sufiiciently to cause it to go through the pass, while thefillet-ribs b', being of greater diameter than the faces b and c, workdown the lateral corners of the bar before it s worked down by the facesb c, (see Fig. 6,) and if any metal is crowded up or down faces c of thepass it impinges against the filletrbs b' and is deflected back andworked into the body of the reduced bar without finning, and anytendency of the metal to crowd along faces b of the pass is checked andprevented by the fillet-ribs b', which form a barrier to prevent anymetal sliding or working bodily over the faces b. i

The increasing dianeter of the rolls from the fillets d to the apex ofthe collars B C causes an intense amount of friction on the bar beingworked, as necessarily the apexes of the collars, by reason of greaterdiameter, travel faster than their bases, and the filletribs b', beingof still greater diameter than any portion of faces b c, will cause thegreatest amount of friction on the bar at two of i its corners wherethere is least metal to heat. This friction is productive of heat sogreat that the corners maintain the same heat as the body of the bar.Tlus the fillet-ribs b' are enabled the more readily to work down itscorners and prevent finning thereof. By properly speeding the rolls somuch frictional heat can be generated as to keep the bar at working heatwhile passing through a number of pairs of rolls in a train withoutimpairing the eifectiveness of the mill. This friction is occasioned bythe slipping of parts of the roll-faces over the bar, owing to theunequal linear peripheral speed of the faces. If the rolls besufliciently speeded, the bar will be finally delivered -as highlyheated as it was when first introduced into the rolls. In fact, I havefound the heat of the bar to be increased by such friction.

In practice Ipropose to employ a number of pairs of my rolls, asindicated in Fig. 4, so that the bar being worked passes directly fromone pair to the next without handling. In order to properly work thebar, however, the alternate pairs of rolls are set in an endwise'eversed position, so that the fillet-ribs in alte'nate pairs willalternately work top and bottom of the edges. The faces b b of the rollshave to hear the principal strain in reducing the metal, becausefillet-ribs b' keep and direct the main body of the metal onto saidfaces, the faces c c being principally effective as guide and moldingfaces. When it is desired to shift the rolls to work a smaller ingot orbar, they are shifted endwise until the fillet-ribs b' are opposed tofaces c, and then set toward each other until the fillet ribs abouttouch the faces c, thus making the pass instead of square to be arectangle of uuequal diameters, as shown in dotted lines in Fig. 2, andthe size of such pass can be varied by shifting the rolls, as described.In such case faces c c are simply guide-faces, and do not or onlyslightly work the metal, which is worked between faces b b andfillet-ribs b' b', and in such case ordinary bar-guides might beemployed to properly direct the bar through the pass. a

I have shown simply a rectangular pass or groove. Its form might bevaried particularly Where it is only desired to have the rolls work ;onesize of bars, the fillet-ribs being formed to protect the openings inthe pass at the meeting faces of the rolls and prevent finning, sub-.stantially as herein specified. A From the foregoing a few of thepractical advantages of this form of reducing-roll will be understood.

Having described my invention, what I claim as new, and desire to secureby Letters =Patent thereon, is-- 1. For a metal-rolling mill, a rollhaving an lannular groove, a fillet at the bottom thereof and afillet-rib at the outer edge of one side of the groove, substantially asdescribed. 2. The combination of a pair of opposed metal-working rolls,each having an annular groove, angular in cross-section and togetherformin g the pass, fillets at the bottoms of said `grooves, and filletsat the corners of the vpass at the meeting-line of the rolls adapted toprevent crowding of the metal between the 'rolls and to reduce thecorners of the ingot or bar, substantially as specified.

3. The combination of the opposite endwise-adjustable rolls havingopposed annular grooves forming the pass, and each having a fillet-ribat one side of its groove, substan- Atially as and for the purpose setforth.-

4. A roll for metal-rolling nills, having a pair of collars B Cdouble-beveled on their peripheries, the former having a fillet-rib b'at its apex and the latter a beveled or rounded edge 02 at its apex,substantially as and for the purpose described.

In testimony that I clain the foregoing as my own I afi'ix my signaturein presence of two witnesses.

FRED NEVEGOLD.

Wtnesses:

T. H. ALEXANDER, W. II. BARNES.

